Fix: Jump to link in checkbox

[alythobani]

Fixes: #242

This PR adjusts the existing link patterns to be more precise and accurate (e.g. take backslashes into account when interpreting brackets as part of link syntax) - and in the context of #242, we now disallow unescaped square brackets inside the [display text] part of a [display text](url) markdown link.

This fixes the issue of a checkbox's square brackets (e.g. - [ ] / - [x]) being considered as the start of a markdown link when a markdown link is part of the checkbox item (e.g. - [ ] This is a [markdown link](https://some-url.com)).

Detailed docstrings have been added to the regexes now that they're even more complex than they were before and some intentional tradeoffs were taken (particularly for MARKDOWN_LINK_REGEX).

This PR also along the way:

• adds the vitest test framework and adds unit tests for the link regexes (jumpToLink.test.ts)
• removes package-lock.json from .gitignore and adds it to the repo's git tracking (generally considered good practice to commit package-lock.json)

[alythobani]

Just getting rid of a bunch of spellcheck warnings in main.ts

[alythobani]

Just prettier doing some auto formatting

[alythobani]

The new regexes are now built as actual regexes from the start (instead of just strings) so that they only need half as many backslashes

[esm7]

Thank you, this is a great contribution!

[alythobani]

For sure, I was meaning to get around to this fix at some point :)

Thanks to you for making the plugin in the first place! It's been great